MWA does the former and does not tell you you shouldn't. It's been a while since I've been at that point so I admit I don't clearly recall what it does say, but it gives no indication that you might not want to do so.
As evidenced by the repeated accounts of people CC-ing at level 30, I think that should be an obvious indicator that things could stand to be a little more clear. Is it too much to ask for the proverbial instruction manual to be a little more... informative?